Fixed by inherit Tool class.

tools/excel_analysis_tool.py

@@ -1,7 +1,8 @@
+from smolagents.tools import Tool
 import pandas as pd
 from huggingface_hub import hf_hub_download
 
-class ExcelAnalysisTool:
+class ExcelAnalysisTool(Tool):
     def __init__(self):
         self.name = "ExcelAnalysisTool"
         self.description = (

tools/wiki_tool.py

@@ -1,6 +1,7 @@
+from smolagents.tools import Tool
 import wikipedia
 
-class WikiTool:
+class WikiTool(Tool):
     def __init__(self):
         self.name = "WikiTool"
         self.description = (